Target initiated negotiations
Bill=Galloway%HW=Stor%Sys=Hou at bangate.compaq.com
Bill=Galloway%HW=Stor%Sys=Hou at bangate.compaq.com
Thu Jun 1 17:15:50 PDT 1995
Rick,
At Compaq we require all targets to initiate negotiations when the
target feels it is necessary (after POR, resets, and BDR). In a hot-plug
environment, it is impossible for the initiator to know that the negotiated
parameters of a target may have changed otherwise.
In general we do not negotiate with a target until we have seen the
inquiry data and know that the target supports negotiation. I have seen
too
many targets that go belly-up if you negotiate with them and they say that
they
do not support negotiation. This has been a problem with older CD-Roms
and tapes.
We are very forgiving about when the target attempts negotiation. It can
be
anytime after the nexus is established and anytime before a message-in that
requires a bus-free. Yes you can negotiate in the middle of data phase and
after a status phase if you want to.
-
Bill Galloway P.O. Box 692000
Compaq Computer Corp. MS 090504
(713) 374-6732 Houston, TX 77269-2000
billg at bangate.Compaq.com
More information about the T10
mailing list